Yes, every company has certain labels they attached to PTO systems - as marketing tools.
My point was, and still is - that the "independent power take-off" in most of the early USA Patents is a dual-clutch setup. And, it is clearly described as being "independent" of the wheel drive. So, going by the original use of the word as it was applied to farm tractors by those that invented it, and also the use of the dictionary-definition, ANY PTO that is able to keep turning while you disengage the wheel drive - is an independent power take-off.
Subsequently, anybody who calls his dual-clutch setup as providing an independent PTO is NOT incorrect. Now, if the argument was based on what Ford, Deere, et. al. called it at the time they were selling it - the argument would be different.
Considering this IS an old tractor forum, seems that the not-too-distant history of tractor development is relevant. Early patents for independent PTOs are clearly described by most of the major companies - each one tweaking it a bit and attempting to make it special enough to get a patent. Earliest that I've read closely are . . . the independent PTO patent filed by Emil Stumpf and Gifford for Huber Mfg. Co. in 1940, the version filed by Henry A. (Harry) Ferguson to International Harvester in 1956, Clarence Hubert, etc.
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